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That is not an OEM impeller regardless of references made by amazon…. Admittedly, I am a bit paranoid about this part only because of how important it is…. If the water pump does not work correctly, the engine will overheat and could get damaged internally. Aftermarket ignition and carburetor items are not big deal, if they fail, they will just have to be replaced, no engine damage will result. Replacing the impeller is kind of a pain also, the powerhead must be removed to disconnect the shift rod and remove the gearcase again.
But, on the other hand, you will probably know pretty quickly when you start the engine, how the water pump is working, so powerhead damage is unlikely. It is up to you…Once you get the gearcase off and the water pump removed, you will have to inspect the aluminum impeller housing and SS impeller plate for wear also…..
I found several carbs on ebay, mostly priced too high, except for this one:
https://www.ebay.com/itm/ANTIQUE-VINTAGE-Outboard-Engine-CARB-CARBURETOR-1956-OMC-5-5-HP/352940383362?hash=item522ce2dc82:g:L6MAAOSwtFteJRJu
And, it is returnable also.
We can post a classified ad here also, these carbs are fairly common…